On or about Saturday, July 30 at 10 p.m., and continuing until Sunday, July 31 at 8 a.m., the eastbound Dulles Greenway at Exit 8A (Old Ox Road east/Route 606) will be detoured to eastbound Old Ox Road while Dulles Corridor Metrorail Project crews construct a large concrete span for the Silver Line Aerial Guideway over the eastbound lanes. Follow detour signs along eastbound Old Ox Road and Route 28 south to the westbound Dulles International Airport Access Highway, Dulles International Airport, or the eastbound Dulles Toll Road.